Bump codecov/codecov-action from 3 to 4

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 3 to 4.
- [Release notes](https://github.com/codecov/codecov-action/releases)
- [Changelog](https://github.com/codecov/codecov-action/blob/main/CHANGELOG.md)
- [Commits](codecov/codecov-action@v3...v4)

---
updated-dependencies:
- dependency-name: codecov/codecov-action
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/pull_request.yml

@@ -38,7 +38,7 @@ jobs:
         run: pytest --dynamodb-dir=${{ steps.install-dynamodb.outputs.dynamodb-dir }} --cov --cov-report=xml
 
       - name: Upload to Codecov.io
-        uses: codecov/codecov-action@v3
+        uses: codecov/codecov-action@v4
 
       - name: Check Types
         run: pip install mypy && mypy .